绳索取心钻杆除了和普通钻杆一样要受复杂的载荷外,还有其自身的特点。(1)为了保证钻具在钻杆内通行无阻,要求钻杆内孔保持平直。(2)钻杆壁薄(仅4.5—5毫米)。(3)钻头底唇面积比普通钻头大25—30％。要求钻进压力大,因之钻杆承受的负荷也大。 在使用绳索取心钻杆的过程中,应根据钻杆上述特点,合理进行操作。但是现场人 Cord Coring In addition to ordinary drill pipe to be complicated by the same load, but also its own characteristics. (1) In order to ensure that the drilling tool is unobstructed in the drill pipe, the inner hole of the drill pipe should be kept straight. (2) thin drill pipe wall (only 4.5-5 mm). (3) drill bottom lip area 25-30% larger than the average drill. Requires drilling pressure, so drill pipe load is also large. In the process of using coring drill pipe, it should be operated reasonably according to the above characteristics of drill pipe. But the scene people